DEBT - Commercial Paper (Details) - Commercial paper - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Short-term Debt [Line Items] | ||
| Maximum borrowing capacity | $ 2,000,000,000 | |
| Maximum amount outstanding during period | 801,000,000 | |
| Short-term debt outstanding | $ 300,000,000 | $ 645,000,000 |
| Weighted average annual interest rate (percent) | 2.00% |